Pathetic !!!

I would like to cancel my Cell C contract<br> <br> Reasons: Pathetic service ( Lack of customer care ) & I never have any reception resulting in my phone changing to ''data roaming'' constantly, not receiving calls / sms etc.<br> <br> I tried to contact your call centre to assist with the cancelation but was transferred from pillar to post with no solution<br> <br> My contract comes to an end on 31/07/2015 however I unfortunately upgraded my phone from the Samsung galaxy s4 to the Samsung galaxy s6 a few weeks ago<br> <br> I would like to cancel my contract and return the phone ( Yes the phone has been opened and is currently in use )<br> <br> The cancellation comes due to poor service from Cell C's side and had the customer service been up to standard I would never of cancelled my contract. Yes there is the unfortunate experience with the lack of signal but I could have lived with that<br> <br> Please advise what the way forward is and what my options would be <br> <br> I feel it would be unfair for me to pay the phone off due to the blame for the cancelation being YOUR's<br>